The horn as a coupling element for acoustic impedance measurements

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TypeArticle
Journal titleJournal of the Acoustical Society of America
ISSN0001-4966
Volume26
Pages503506; # of pages: 4
SubjectAcoustics
AbstractImpedance tube methods of testing acoustical materials are restricted to frequencies below the value for which the wavelength is approximately equal to the largest lateral dimension of the tube. Above this frequency, extraneous modes of propagation interfere with measurements. The restriction is a serious one for typical acoustical materials that cannot adequately be sampled in less than 1 square foot. It has been found that the difficulty may be circumvented by using a horn to couple a large sample to a small impedance tube. Comparisons between horn and tube measurements have been made for a range of absorptive materials.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierDBR-RP-12
NRC number3311
2889
NPARC number20374507
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Record identifier72bcf444-bed0-443a-9d32-860fef161b85
Record created2012-07-23
Record modified2016-05-09
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